In this paper, Favaro describes a special disposition of the buccal mucous membrane, exceptionally met with in man, and corresponding to a condition constant in the majority of the other mammalia. It consists in the presence, in the upper and in the lower jaw on each side, of a fold passing from the internal surface of the lip backwards and inwards to the interval between the alveoli of the canine and first premolar. It is brought into view (as is shown by an illustration) by grasping the lip near the commissures and everting it moderately. Robin and Magitot have described similar folds in the buccal mucous membrane of the child during the first months of life.
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